Cornerstone Interview Questions

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Majority Element

Suppose we're given an array of numbers like the following: 4, 2, 4 Could you find the majority element? A majority is defined as "the greater part, or more than half, of the total. It is a subset of a set consisting of more than half of the set's elements." Let's assume that the array l...

Difficulty: 3/10

Shortest Path Distance in Matrix

You are given a 2D matrix with several characters contained in its cells. You will also have two distinct characters which are guaranteed to be in the given matrix. Your job will be to find the minimum manhattan distance lessons what is the manhattan distance between the two characters in the mat...

Difficulty: 8/10

Two Sum from BST

This problem is a fun combination of the famous Two Sum problem combined with a binary search lessons binary search technique tree. Given the root of a binary search lessons binary search technique tree, and a target integer K , return true if there exist two nodes in the said tree...

Difficulty: 7/10

Dutch National Flag Problem

This problem is named the "Dutch national flag problem" because the flag of the Netherlands is comprised of the colors red, white, and blue in separate parts. Although we won't be using colors, the premise of the challenge is to develop a sorting algorithm that performs some form of separations of th...

Difficulty: 8/10

Swap Every Two Nodes in a Linked List

Write a recursive algorithm that swaps every two nodes in a linked list. This is often called a pairwise swap. For example: js * original list 1 2 3 4 after swapping every 2 nodes 2 1 4 3 * You may assume that the definition of a linked list node is: ...

Difficulty: 4/10

Longest Increasing Subsequence

The Longest Increasing Subsequence LIS is a subsequence within an array of numbers with an increasing order. The numbers within the subsequence have to be unique and in an ascending manner. It's important to note that the items of the sequence do not have to be in consecutive locations within the...

Difficulty: 8/10

Sum Digits Until One

We're provided a positive integer num . Can you write a method to repeatedly add all of its digits until the result has only one digit? Here's an example: if the input was 49 , we'd go through the following steps: start with 49 4 9 13 since the previous addition was 13, move ont...

Difficulty: 4/10

Flood Fill Paintbucket

Imagine the implementation for the paintbucket feature in Microsoft Paint, or how certain image filters work. You click on a specific pixel on a screen, and every similar colored neighboring pixel would change to your selected color. Let's implement a simpler version of that feature. You're gi...

Difficulty: 7/10

Levenshtein Edit Distance

An edit distance is a way to quantify how different two strings are. This is calculated using **the minimum number of transformations to turn one string to another**. The transformations include insertion , deletion , and substitution . So when comparing two identical strings, say cat and ca...

Difficulty: 7/10

Class vs. Prototypical Inheritance

JavaScript, the ubiquitous language of the web, has long been a source of intrigue for developers, particularly when it comes to object oriented programming OOP concepts. While most OOP languages rely on classes as the cornerstone of inheritance, JavaScript takes a unique approach, utilizing pr...

Difficulty: 5/10

Memoization in Dynamic Programming Through Examples

Dynamic programming is a technique for solving problems, whose solution can be expressed recursively in terms of solutions of overlapping sub problems. A gentle introduction to this can be found in How Does DP Work? Dynamic Programming Tutorial lessons how does dp work dynamic programming expl...

Difficulty: 5/10

[CDN Case Study] Akamai Summary and Architecture

Unpacking the Akamai Network: A Cornerstone of Modern Internet Infrastructure _This is a summary of the original Akaimai Network whitepaper, which can be found at this link https: github.com papers we love papers we love blob master distributed_systems the akamai network.pdf _. The Essenc...

Difficulty: 5/10

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